Sargocentron ensifer, or the yellow-striped squirrelfish, is a member of the family Holocentridae. It is native to the Pacific Ocean from southern Japan to New Caledonia, Hawaii and the Pitcairn Islands. It lives in deep reefs at depths between 0 and 64 metres (0 and 210 ft), hiding in crevices by day and foraging for food by night. It feeds on small fishes and crustaceans and can reach sizes of up to 23.0 centimetres (9.1 in) SL, though a length of 15.0 centimetres (5.9 in) TL is more common.

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